The Riddler

12345
Across
  1. 2. what occurs twice in every moment, once in every minute, but also never, ever in a hundred thousand years?
  2. 5. Re-arrange the letters, O O U S W T D N E J R, to spell just one word. What is it?
Down
  1. 1. David's father has three sons: Snap, Crackle, and _____?
  2. 3. The best game in the world (hint: starts with r
  3. 4. What has many keys, but can't even open a single door?